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Objective: Dynamic knee valgus is a common movement disorder among volleyball athletes, being a risk factor for injuries of this joint, which could negatively impact the production of muscular power. Thus, the aim of this study was to evaluate the influence of dynamic knee valgus laterality (uni- vs. bi-lateral) on the performance of horizontal jumping of young volleyball players. Method: To that end, 22 competitive volleyball athletes (eight males and 14 females) were selected and divided into the following groups: unilateral knee valgus [VU - n = 10, age (years): 13.7 ± 1.4; body mass (kg): 56.9 ± 12.9; 163.5 ± 9.2] and bilateral [VB - n = 12, age (years): 13.6 ± 2.3; body mass (kg): 52.8 ± 13.8; stature (cm): 165.91 ± 8.65]. The athletes performed three horizontal jumps and the horizontal distances obtained (the best three attempts in cm) were submitted to statistical analysis (t-test for independent samples) to verify differences between the VU and VB groups. Results and discussion: There were no significant differences between VU vs. VU groups (VU: 166.2 ± 22.0; VB: 162.6 ± 21.3); p = 0.703). Conclusion: In the present study, the presence of dynamic knee valgus/laterality was not a factor that could influence the physical performance, particularly of the muscular power of lower limbs evaluated by jumping tests of young athletes of volleyball.

Valgo dinâmico de joelho e desempenho de salto entre atletas jovens de voleibol